Some outputs not working

Hello everyone,
I am configuring my VTOL with Orange flight controller, the problem I encountered is that two of the main (num 5 & 8) and two of the auxiliary outputs (3 & 4) seem not to work at all, as no response could be seen from the ESCs or servos that are connected to them.
I should mention that the servo outputs are set correctly since other outputs are working properly.
Although I was able to do my configuration with the help of other outputs, I wonder whether this problem is related to the wrong or incomplete configuration or a bug in the firmware, or the hardware itself.
Your advice would be greatly appreciated